drains into Eightmile Creek, 51 mi. NW of Tyonek, Alaska Ra
Local descriptive name reported in 1954 by U.S. Geological Survey (USGS).
Cosna Bluff,
Vachon Island,
Long Lake, Spring Camp Lake, Top Lake,
Patterson Chutes,
Cosna River, Williams Slough,
Cosna Slough, Little Williams Slough,
Rock Creek,
Cos Jacket,